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1051.

Question : List out the adaptations of xerophytes?

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Solution :The conditions that leads to adaptation of plants in a dry habitat are,
i. To absorb as much water as they can get from the surroundings.
ii. To retain water in their organs for very long time.
III. To reduce the transpiration rate,
iv. To reduce consumption of water.
Adaptations of xerophytes
1. They have WELL developed ROOTS. Roots grow very deep and reach the layers where water is available as in Calotropis.
2. They store water in succulent water storing parenchymatous tissues. e.g. Opuntia, Aloe vera.
3. They have small sized leaves with waxy coating. e.g. Acacia. In some plants, leaves are modified into spines. c.g. Opuntia.
4. Some of the xerophytes complete their life cycle within a very short period when sufficient MOISTURE is available.
Discussion
1052.

Question : Complete the table

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SOLUTION :
Discussion
1053.

Question : List major factors for which the crop variety improvement is done. Illustrate any two of them.

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Solution :List of major factors:
Two important factors among them are improved quality and bioticand abiotic RESISTANCE.
Improved Quality: The expectations for improving the crops may vary from crop to crop. Baking quality is considered ilmportant in wheat whereas protein quality is important for pulses. Oil quality in oil seeds and PRESERVING quality in fruits and vegetables are taken into consideration. THe crp quality is improved as per the needs.
Biotic and abiotic resistance: Crops production can go down due to different factors such as biotic and abiotic. Among biotic factors diseases, insects adn nematodes, funga, infections, etc. are to be considered. Abiotic factors such as drought, salinity, water logging, heat , COLD and FROST, etc. can cause stressful situation for the plants. Varieties resistant to these stresses are therefore created which then improves crop production.
Discussion
1054.

Question : Complete the given table.

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Solution :
(a) VIRUS (b) Mosquito bite (c ) Bacteria (d) AIDS (E ) Sexual contact (f) DROPLET INFECTION (air)
Discussion
1055.

Question : List of importatnt parts of the respiratory system in humans?

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Answer :NOSTRIL,NASAL CAVITY,Trachea,Bronchus,Bronchiole,ALVEOLUS,Pleura and diaphragm.
Discussion
1056.

Question :Complete the following chart:

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SOLUTION :
Discussion
1057.

Question : List five characterstic features of fishes.

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Solution :(i) Fishes are poikilothermic, whose internal temperatures varies, CONSIDERABLY.
(II) The body has a covering of scales.
(iii) Body muscles are arranged into segments called myotomes.
(IV) The body is differentiated into head, trunk and tail.
(v) RESPIRATION is DONE by 5 to 7 pairs of gills, which are covered by an operculum or sometimes may be naked.
Discussion
1058.

Question : Complete the flow chart related to photosynthesis:

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ANSWER :a)Light is required
b) GLUCOSE is produced
C) TAKES place in the GRANA
Discussion
1059.

Question : Complete the flowchart which showing the flow of CO_2 and water reach the leaves for photosynthesis

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ANSWER :`CO_2`
SOIL
ROOT
PHLOEM
Discussion
1060.

Question : Complete the crossword puzzle (Fig.) Across 1. Oil yielding plant (9) 2. Crop grown in winter season (4) 5. Fixed by Rhizobium (8)9. Common honey bee (4)Downward 2. Animal feed (6) 4. A micronutrient (5) 6. Unwanted plant in crop fields (4) 7. An exotic breed of chicken (7) 8. Bottom feeders in fish pond (7) 10. A marine fish (4)

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Solution :ACROSS
1. SUNFLOWER
3. Rabi
5. Nitrogen
9. Apis
Downward
2. Fodder
4. Boron
6. WEED
8. Mrigals
10. Tuna.
Discussion
1061.

Question :List any two benefits of classification.

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Solution :(1) SCIENTIFIC and taxonomic research is possible due to classification. (2) Classification helps to understand the BASIC CHARACTERS of the organisms.
Discussion
1062.

Question : Complete the crossword puzzle figure Across 1. Oil yielding plant (9) 3. Crop grown in winter season (4) 5.Fixed by Rhizobium (8) 9.Common honey bee(4) Downward 2. Animal feed (6) 4.A micronutrient (5) 6. Unwanted plant in crop fields (4) 7. An exotic breed of chicken (7) 8. Bottom feeders in fish pond (7) 10. A marine fish (4)

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SOLUTION :
Discussion
1063.

Question : List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor ? Why or why not?

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Solution :(1) There is persistent headache. (2) There is BODY ache and feeling of TIREDNESS. (3) There is low grade fever. Even if a single symptom of this is seen, we will rush to the doctor.
Any kind of health problem should be checked Immediately. It can be a serious sign of some DANGEROUS disease too. In order to keep ourselves SAFE, we should visit a doctor. Though we experience the symptom, doctor understands the signs through his or her EXPERTISE.
Discussion
1064.

Question : Complete the chart by selecting the items from the given list ? {:("Crops","Major constituent","Examples"),("____","Carbohydrate","__ , rice, maize"),("Pulses","____","Gram, __ , __"),("____","Fat","__ , __ , ground nut"):}List of items : Sunflower, oil seeds, cereals, wheat, pea, mustard, proteins, lentil

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Solution :`{:("Crops","Major constituent","Examples"),("Cereals","Carbohydrate","Wheat , RICE, maize"),("Pulses","Protein","Gram, pea , LENTIL"),("Oil seeds","Fat","Sunflower , mustard , GROUND nut"):}`
Discussion
1065.

Question : List any three reasons why you would think that you aresick and ought to see a doctor. If only one of three symptoms were present, would you still go to the doctor? Why or why not.

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Solution :COMMON symptoms which indicate sickness are
* Headache *Cough * Dysentry
If only one of these symptoms is present we USUALLY do not visit a doctor. This is because such symptoms do not have MUCH effect on our, general health and ability to WORK. However, if a person is experiencing these symptoms for quite sometime, then he needs to visit a doctor for PROPER treatment.
Discussion
1066.

Question : Compare layers and broilers.

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ANSWER :N/a
Discussion
1067.

Question : List any three human activies that you think lead to air pollution.

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Solution :The following three human activities would lead to air pollution:
(i) Burning of fossil fuels such as COAL and PETROLEUM
(ii) INDUSTRIALIZATION
(III) DEFORESTATION
Discussion
1068.

Question : Compara the use of manure and fertilizers in maintaining soil fertililty.

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SOLUTION :
Discussion
1069.

Question : Companion cells are closely associated with _______

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SIEVE elements
vessel elements
tricchomes
GUARD CELLS

ANSWER :A
Discussion
1070.

Question : Lining of small intestine is made up of _______

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ANSWER :COLUMNAR EPITHELIUM
Discussion
1071.

Question : Common characters found in all members of a category higher than species are called ?

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ANSWER :N/a
Discussion
1072.

Question : Light reaction occures in the……………

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ANSWER :GRANA of CHLOROPLAST
Discussion
1073.

Question : Comment on the aquatic and terrestrial habits of amphibians.

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SOLUTION :(i) The transition from aquatic to terrestrial living is clearly indicated in Amphibian.
(ii) They are the first vertebrates to live on land.
(iii) Amphibians have dual adaptation to live in aquatic and land ENVIRONMENTS.
(iv) The DOUBLE life is CALLED amphibious.
(v) In frogs the hind limbs have webbed feet.
(vi) The skin is moist and glandular USUALLY without scale.
(vii) Respiration is by gills, lungs, skin and pharyngeal region.
(viii) The heart has three chambers, with two auricles and a single ventricle.
(ix) Fertilization is external.
(x) The larva is a tadpole, which is metamorphoses into an adult.
Discussion
1074.

Question : Lichens have symbiotic relationship between:

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ALGAE and FUNGI
Fungi and BRYOPHYTES
Algae and Bryophytes
Fungi and Bacteria

Solution :Algae and Fungi
Discussion
1075.

Question : Column I shows the scientific names of the honeybee and Column II shows their characteristics /origin. Match the pair properly:

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ANSWER :1-d,2-c,3-b,4-a
Discussion
1076.

Question :Lichen is a symbiotic relation between fungi and blue-green algae.

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ANSWER :T
Discussion
1077.

Question : Column I shows the method for improvement of crop and Column II shows their methods. Match the pair properly:

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ANSWER :1-b,2-a,3-d,4-c
Discussion
1078.

Question : Column I shows name of crop (food) and Column II shows the main nutrient obtained from them. Match the pair properly:

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ANSWER :1-b,2-d,3-a,4-c
Discussion
1079.

Question :Lichen is a ......... living form. (parasitic, symbiotic, autotrophic)

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SOLUTION :SYMBIOTIC
Discussion
1080.

Question : Column I shows plants (crops) and Column II shows their types. Match the pair properly:

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ANSWER :1-c,2-a,3-d,4-b
Discussion
1081.

Question : Level of which vitamins is kept high in the poultry feeds?

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Solution :The level of VITAMINS A and K is kept HIGH in the poultry feeds.
Discussion
1082.

Question : Column I shows nutrients and Column II shows its source. Match the pair property:

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ANSWER :1-c,2-d,3-a,4-b
Discussion
1083.

Question : Column I shows fish culture fish and column II shows the area (zone) of getting food in the pond. Match the pair properly:

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ANSWER :1-b,2-a,3-d,4-c
Discussion
1084.

Question : Let us take a glass slide with a drop of water on it. Using an ice cream spoon gently scrape the inside surface of the cheek. Does any material get stuck on the spoon ? With the help of a needle we can transfer this material and spread it evenly on the glass slide kept ready for this. To colour the material we can put a drop of methylene blue solution on it.Now the material is ready for observation under microscope. Do not forget to put a cover-slip on it. Was there a darkly coloured, spherical or oval, dot-like structure near the centre of each cell ? Were there similar structures in onion peel cells?

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Solution :Nucleus of human cheek cell is DARKLY stained, spherical or oval and CENTRALLY placed. The nucleus of onion cells is SHIFTED to ONE side than being in central POSITION.
Discussion
1085.

Question : Column I shows characteristics of nutrients for plants and Column II shows the corresponding number of nutrients. Match the pair properly:

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ANSWER :1-d,2-c,3-b,4-a
Discussion
1086.

Question : Let us take a glass slide with a drop of water on it. Using an ice cream spoon gently scrape the inside surface of the cheek. Does any material get stuck on the spoon ? With the help of a needle we can transfer this material and spread it evenly on the glass slide kept ready for this. To colour the material we can put a drop of methylene blue solution on it.Now the material is ready for observation under microscope. Do not forget to put a cover-slip on it. What do we observe? What is the shape of the cells we see?

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Solution :The CELLS of cheek SEEN under LOW power are round or oval. There is no cell wall. The prominent CENTRAL nucleus is seen. Cell membrane is seen in high power.
Discussion
1087.

Question : Collect some fallen parts of plants and animals and classify them on the basis of their form, shape etc.

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ANSWER :N/a
Discussion
1088.

Question : Collect some crop plants available locally and study whether they are infested with any pathogen. Try to identify some diseases of the crop plants.

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ANSWER :N/a
Discussion
1089.

Question : Let us tak a smallpiece from an onion bulb.With the help of a pair of forceps. We can peel off the skin (called epidermis) from the concave side (inner layer) of the onion. This layer can be put immediately in a watch-glass containing water. This will prevent the peel from getting folded or getting dry. Let us take a glass slide, put a drop of water on it and transfer a small piece of the peel from the watch-glass to the slide. Make sure that the peel is perfectly flat on the slide. A thin camel hair paintbrush might be necessary to help transfer the peel. Now we put a drop of safranin solution on this piece followed by a cover slip. Take care to avoid air bubbles while putting the cover slip with the help of a mounting needle. We have prepared a temporary mount of onion peel. We can observe this slide under low power followed by high powers of a compound microscope. What do we observe as we look through the lens ? What do we observe as we look through the lens ?

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Solution : If the epidermal fold of the onion bulb ismounted on the slide and observed we can observe following structures in this temporary mounting:
(1) Epidermal cells which are slightly RECTANGULAR in shape.
(2) All the cells are SIMILAR in shape and size.
(3) There is nucleus which takes up the stain.
(4) Cytoplasm surrounds the nucleus.
(5) In high power, the nucleus is clearly seen and a faint outline of cell wall is also visible.
Discussion
1090.

Question : Collect information related to the production of milk and milk product in nearby dairy farm.

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ANSWER :N/a
Discussion
1091.

Question : Let each of the student bring any food packet ( jam , juice , pickle , bread , biscuit , ect ) . Not down the details like name of the product , manufacture's detils , contents / ingredients , net weight , Maximum Retail Price (MRP) , date of manufacture , date of expiry / best befor twelve month from the date of manufacture and standardized marks like ISI , AGMARK or FPO printed on the lable for each of the items to create awareness .

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Solution :Name of the product- Thenkuzhal
Manufacturer.s details - Sri Krishna SWEETS. HANDMADE to provide the authentic taste.
Ingredients - Rice flour, Refined vegetable oil, Urud dhal, Butter, Iozized salt, Cumin, Asafoetida.
Net WEIGHT - 500 gms.
Maximum Retail PRIZE - (MRP) Rs. 100.
Date of Manufacture - 09.04.2018.
Date of Expiry - Best before 30 days from the date of manufacture.
Discussion
1092.

Question : Collect information regarding poultry birds of India. You can collect photographs of different breeds of chickens and paste them in your scrapbook or chart.

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ANSWER :N/a
Discussion
1093.

Question : Collect at least five medical plants from your locality.Identify the plant and try to find out its medicinal value.

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Solution :STUDENTS can PERFORM this ACTIVITY under the GUIDANCE of the CLASS teacher.
Discussion
1094.

Question : Layer (Egg layer) and Broiler

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SOLUTION :
Discussion
1095.

Question : Cod liver oil is rich is vitamin B.

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ANSWER :T
Discussion
1096.

Question : Lactation period of high-yielding variety of cows spans

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100 days
200 days
300 days
30 days

Answer :C
Discussion
1097.

Question : Lack of adequate fats in diet may result in low body weight.

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ANSWER :1
Discussion
1098.

Question : Cnidarians lack

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mesoderm
stinging cells
collar cells
scoelenteron

Answer :A::C
Discussion
1099.

Question : Cnidoblasts are

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FLAGELLATED cells
Collar cells
Provided with BARBED thread
sex cells

Answer :C
Discussion
1100.

Question : Kingdom Monera includes:

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UNICELLULAR EUKARYOTIC organisms
PROKARYOTIC BACTERIA
Multinucleate HIGHER fungi
Multicellular animals

Solution :Prokaryotic bacteria
Discussion